Uv and ir hygrometers: Difference between revisions
From Glossary of Meteorology
imported>Perlwikibot (Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == UV and IR hygrometers == </div> <div class="definition"><div class="short_definition">Instr...") |
imported>Perlwikibot No edit summary |
||
| Line 9: | Line 9: | ||
</div> | </div> | ||
<div class="definition"><div class="short_definition">Instruments using [[absorption]] of [[electromagnetic radiation]] to sense [[humidity]].</div><br/> <div class="paragraph">[[Ultraviolet]] (UV) [[hygrometers]] use a single [[wavelength]] absorbed by molecular [[water vapor]], such as the Lyman-alpha line produced by a [[hydrogen]] discharge tube. [[Infrared]] (IR) hygrometers can also operate on a single [[absorption line]] if the source is an infrared-emitting tunable [[diode laser]] (TDL), though broad-band instruments, which integrate the absorption across many individual lines, are also used. These instruments utilize [[Beer's law]] to estimate the [[density]] of absorption across the path between the source and a detector (e.g., an [[ionization]] tube for ultraviolet, or a photodiode for infrared), which contains the air sample. In many cases, these hygrometers have sufficient speed of response that they can resolve rapid turbulent fluctuations of humidity.</div><br/> </div> | <div class="definition"><div class="short_definition">Instruments using [[absorption]] of [[electromagnetic radiation]] to sense [[humidity]].</div><br/> <div class="paragraph">[[ultraviolet|Ultraviolet]] (UV) [[hygrometers]] use a single [[wavelength]] absorbed by molecular [[water vapor]], such as the Lyman-alpha line produced by a [[hydrogen]] discharge tube. [[infrared|Infrared]] (IR) hygrometers can also operate on a single [[absorption line]] if the source is an infrared-emitting tunable [[diode laser|diode laser]] (TDL), though broad-band instruments, which integrate the absorption across many individual lines, are also used. These instruments utilize [[Beer's law]] to estimate the [[density]] of absorption across the path between the source and a detector (e.g., an [[ionization]] tube for ultraviolet, or a photodiode for infrared), which contains the air sample. In many cases, these hygrometers have sufficient speed of response that they can resolve rapid turbulent fluctuations of humidity.</div><br/> </div> | ||
</div> | </div> | ||
Latest revision as of 17:11, 25 April 2012
UV and IR hygrometers
Ultraviolet (UV) hygrometers use a single wavelength absorbed by molecular water vapor, such as the Lyman-alpha line produced by a hydrogen discharge tube. Infrared (IR) hygrometers can also operate on a single absorption line if the source is an infrared-emitting tunable diode laser (TDL), though broad-band instruments, which integrate the absorption across many individual lines, are also used. These instruments utilize Beer's law to estimate the density of absorption across the path between the source and a detector (e.g., an ionization tube for ultraviolet, or a photodiode for infrared), which contains the air sample. In many cases, these hygrometers have sufficient speed of response that they can resolve rapid turbulent fluctuations of humidity.
